Rough terrain for a coach (7)
I believe the answer is:
trainer
'a coach' is the definition.
(thesaurus)
'rough terrain' is the wordplay.
'rough' indicates anagramming the letters.
'terrain' is an anagram of 'TRAINER'.
'for' is the link.
(Other definitions for trainer that I've seen before include "Sports footwear" , "Soft shoe, small aircraft" , "one might put one's foot in it" , "Comfortable shoe" , "Casual shoe" .)